Method and apparatus for producing crinkled yarn



April 17, 1956 1.. VANDAMME ErAL 2,741,893

METHOD AND APPARATUS FOR PRODUCING CRINKLED YARN Filed Jan. 14, 1953 United States Patent Ofiice 2,741,893 Patented Apr. 17, 19 56 METHOD AND APPARATUS FOR PRODUCING CRINKLED YARN Louis Vandamme and Louis Rouyer, Saulce, France, as-

signors to Moulinage et Retorderie de Chavanoz, Paris, France, a corporation of France This invention relates to the production of a crinkled yarn and is particularly applicable to yarns composed of thermoplastic filaments, such as nylon or Rhovyl (a polyvinyl chloride product).

One method heretofore used for producing a crinkled yarn involves imparting a false twist, setting and allowing the yarn to untwist. In known apparatus for this purpose the yarn is held between a pair of supports such as'feed rollers and a'false twist is applied to the span of yarn thus held. The twist is set in various ways and is allowed to disappear as the yarn advances.

The present invention provides an improved and greatly simplified means for carrying out the above steps wherein the yarn is in the form of substantially parallel filaments, is fed through a setting zone and then through a false twister. The setting zone may comprise a vessel of hot water or steam. The false twister is disposedto apply a twist to the yarn as it leaves the setting vessel and without intervening confining guides or feed rollers so that the twist feeds along the yarn contra to its directional feed into the setting zone where it becomes set. As the yarn advances from the setting zone beyond the false twister the twist in the yarn disappears, leaving the yarn in a crinkled state.

The nature of the invention will be better understood from the following description, taken in connection with the accompanying drawing in which the figure is a diagrammatic view of the apparatus embodying the invention.

Referring to the drawing more in detail, a yarn 1 composed of nylon or other thermoplastic filaments, untreated or with only a slight twist is fed froma spool 2 over a guide 3 into a tank 4 containing boiling water. The yarn is guided in the water by guides 5 and 6.

The yarn extends vertically from the guide 6 and passes through a rotating tube 7 of known type having an eyelet 8 which produces a false twist of, for example, 3500 turns per meter of linear feed of the yarn. The twist advances in the yarn contra to the direction of feed into the tank 4 and is set by the action of the hot water. The yarn is then rewound on a spool 9.

The yarn, with the false twist set and then removed beyond the false twister, becomes permanently crinkled.

The process is continuous and can be carried out to produce a uniform crinkled product.

The yarn must be free between the setting zone and the false twister so that the advance of the twist along the yarn is unimpeded'and the distance must be such that the portion of the yarn in the setting zone becomes highly twisted.

Although a specific embodiment has been set forth for purposes Of l1ll1Silal'.l0l1 it is to be understood that the invention is not to be restricted thereto, but that changes and modification may be made therein as will be apparent to a person skilled in the art.

What is claimed is: a

l. The method of producing a crinkled yarn from a bundle of substantially parallel, synthetic thermoplastic filaments, which comprises passing said bundle through a heating medium, applying a false twist to the bundle in a twisting zone after emerging from said heating medium and while unconfined between said heating medium and said twisting zone to cause the twist to feed along the bundle backwardly into said heating medium, and confining the bundle to arrest the twist at a point within said heating medium to prevent the twist from feeding to the bundle in said medium in advance of the confining point, whereby the crinkle becomes set between the confining point and the false twisting zone and the twist disappears again after the bundle passes the twisting zone.

2. The process set forth in claim 1 in which the heating medium is hot water.

3. Apparatus for producing crinkled yarn from a bundle of substantially parallel, synthetic, thermoplastic fila ments, comprising a vessel containing a heating medium, means feeding the bundle through the medium in said vessel, a rotating member adapted to produce a false twist, means feeding the bundle from said vessel in an unconfined path through said rotating member whereby the twist in said yarn can freely feed backwardly into said vessel, and twist arresting means in said vessel confining the bundle to prevent feeding of the twist to the bundle in said medium in advance of said arresting means, whereby the crinkle is set in the filaments between said arresting means and said rotating member and the twist disappears after the bundle passes .beyond said rotating member.

References Cited in the file of this patent UNITED STATES PATENTS 2,080,905 Bartell May 18,1937 2,089,199 Finlayson et al Aug. 10, 1937 2,111,209 Dreyfus Q. Mar. 15, 1938 2,111,211 Finlayson et al. Mar. 15, 1938 2,244,832 Finlayson et al. June 10, 1941 2,463,618 Heberlein et al. Mar. 8, 1949 2,463,620 Heberlein Mar. 8, 1949 2,475,922 Stockly July 12, 1949 2,477,909 Stockly Aug. 2, 1949 

1. THE METHOD OF PRODUCING A CRINKLE YARN FROM A BUNDLE SUBSTANTIALLY PARALLEL, SYNTHETIC THERMOSPLASTIC FILAMENTS, WHICH COMPRISES PASSING SAID BUNDLE THROUGH A HEATING MEDIUM, APPLYING A FALSE TWIST TO THE BUNDLE IN A TWISTING ZONE AFTER EMERGING FROM SAID HEATING MEDIUM AND WHILE UNCONFINED BETWEEN SAID HEATING MEDIUM AND SAID TWISTING ZONE TO CAUSE THE TWIST TO FEED ALONG THE BUNDLE BACKWARDLY INTO SAID HEATING MEDIUM, AND CONFINING THE BUNDLE TO ARREST THE TWIST AT A POINT WITHIN SAID HEATING MEDIUM TO PREVENT THE TWIST FROM FEEDING TO THE BUNDLE IN SAID MEDIUM IN ADVANCE OF THE CONFINING POINT WHEREBY THE CRINKLE BECOMES SET BETWEEN THE CONFINING POINT AND THE FALSE TWISTING ZONE AND THE TWIST DISAPPEARS AGAIN AFTER THE BUNDLE PASSES THE TWISTING ZONE. 